Improvement in machines for straightening metal bars



3 Sheets--Sheet1.

S. P. M. TASKER. improvement in Machines for Straightening Metal Bars.

Patented June 25,1872.

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S. P M. TASKER.

Improvement in Machines for Straightening Metal Bars..

Patented June 25,1872.

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S. P. M. TASKER. mlmprovement in Machines for Straightening Metal Bars.

Patented June 25,1872.

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UNI ED STATES PATENT OEEIcE.

STEPHEN P. M. TAsKEE," OF PHILADELPHIA, PENNSYLVANIA;

IMPROVEMENT IN MACHINES FOR STRAIGHTENING METAL BARS.

Specification forming part of Letters Patent No. 128,335, dated June 25, 18,72.

Specification describing certain Improvements in Machines for Straightening Metal Bars and Tubes, invented by STEPHEN P. M. TASKER, of the city of Philadelphia and State of Pennsylvania.

My invention relates to the combination, with two pairs of grooved rolls, through which the bars or tubes are passed, of a pair of similar rolls, so arranged between the former as to straighten the bars or tubes in their passage through the series of rolls. I connect the intermediate rolls with a sliding bed-plate, which is moved, by any suitable mechanism, at right angles to the line of motion of the bar, so as to admit of being so adjusted that the grooves of .the rolls with which it is provided shall be more or less out of line, as may be required, with the grooves of the other rolls, in accommodation to straightening cold metal, which has a tendency to partially spring back from the position in which it is forced. In passing the cold bars through the series of rolls the crook is placed in an opposite direction to the crook in the line of motion through which it is caused to pass, so that it issprung somewhat crooked in an opposite direction; and then the partial springing back causes it to come to a straight condition.

Figure 1 is a plan view of the improved machine. Fig. 2, Sheet No. 2, is a side elevation of the same. Fig. 3, Sheet No. 3, is an end elevation. Fig. 4 is an isometrical view of the bed-plate G. Fig. 5 is a like view of the slide F.

Like letters in all the figures indicate the same parts.

A is the bottom plate of the machine; and

B B, the housings. O G and G O are pairs of shafts, whose journals turn in the housings. The shafts G G are provided with grooved feed-rolls D D, and the shafts G G with like rolls D D, the grooves in each pair of rolls corresponding to the size and shape of the bars or tubes to be straightened. Between the pairs of rolls D D and D D there are like rolls E E, which act, in conjunction with the rolls D D and D D, in straightening the iron in its passage through the series of rolls. In straightening hot bars or tubes the grooves of the intermediate rolls E E should be in line with the grooves of the rolls D D and D D, as the ironwill remain in the form, lengthwise, that it leaves the rolls, with the exception of the natural springing caused in cooling. But, in straightening cold metal, which always has a tendency to spring back, this tendency should be counteracted by so adjusting the-intermediate rolls as to have their grooves out of line with the other rolls, so that the bars or tubes, when so placed as to have their bends contrary thereto, shall be sprung somewhat in a reverse direction as they pass through the rolls, that the natural springing back may bring them straight. To

accomplish this object Iconnect the intermediate rolls E E with a slide, F, which is connected with the bed-plate G by means of the tongues 64 a of the slide, and grooves b b of the bed-plate. The slide and bed-plate are shown in detail in Figs. 3 and 4., respectively. The slide F is adjustable by means of the screw-rod H. I have in the drawing represented the slide in a horizontal position, by which the rolls E E are caused to revolve in a plane at right angles to the plane in which the rolls D D and D D revolve. It will answer, however, to place the slide in a vertical position, which will cause the rolls to run all in the same plane. I prefer the former arrangement, however, for the sake of convenience. I have represented the shafts G G and G 0 all connected by means of gear-Wheels I, there being an intermediate wheel, I, on the driving-shaft J, which connects the two upper wheels. But I do not confine myself to the particular mode inwhich they are geared.

If desired, the intermediate rolls E E may be geared together, and then geared with the driving-shaft, or with either of the other shafts.

Instead of actuating the slide F by means of the screw-rod H, any other suitable device may be used.

I claim as my invention- The combination of the adjustable slide F and rolls E E with the rolls D D and D D, the said slide being operated by means of the screw-rod H or other suitable mechanism, substantially as described.

STEPHEN P. M. TASKER.

Witnesses THOMAS J. BEWLEY, STEPHEN USTICK. 

